A historical text may now be unreadable, because its language is unknown, or its script forgotten (or both), or because it was deliberately enciphered. Deciphering needs two steps: Identify the language, then map the unknown script to a familiar one. I’ll present an algorithm to solve a cartoon version of this problem, where the language is known, and the cipher is alphabet rearrangement.
9. 1. Introduction
Cipher textPlain text
encryption
decryption
“the cat sat on the mat” “uif dbu tbu po uif nbu”
Encryption & decryption
10. 1. Introduction
Cipher textPlain text
encryption
decryption
“the cat sat on the mat” “uif dbu tbu po uif nbu”
Encryption & decryption
“Mono-Alphabetic Substitution Cipher” (MASC)
Replace each plain text letter with a single, fixed cipher text letter.
Algorithm:
11. 1. Introduction
Cipher textPlain text
encryption
decryption
“the cat sat on the mat” “uif dbu tbu po uif nbu”
Encryption & decryption
“Mono-Alphabetic Substitution Cipher” (MASC)
Replace each plain text letter with a single, fixed cipher text letter.
Algorithm:
{a 7! b, b 7! c, . . .}<latexit sha1_base64="v4rjKncKUxiOht1plgEILCpWNAA=">AAACD3icdVDLSgMxFL1TX7W+Rl0KEiyKi1JmXNh2IwU3LivYB3RKyWTSNjTzIMkIZegfuHHZnd/gxoUibt2682/MtCo+DwROzrmX5Bw34kwqy3o1MnPzC4tL2eXcyura+oa5udWQYSwIrZOQh6LlYkk5C2hdMcVpKxIU+y6nTXd4mvrNSyokC4MLNYpox8f9gPUYwUpLXfPASTByfBxJFSK3gNzPCykgh3uhksgZ57pm3ipWSuVy5Rj9JnbRmiJf3Z1MbgCg1jVfHC8ksU8DRTiWsm1bkeokWChGOB3nnFjSCJMh7tO2pgH2qewk0zxjtK8VD/VCoU+g0FT9upFgX8qR7+pJH6uB/Oml4l9eO1a9cidhQRQrGpDZQ72YIx03LQd5TFCi+EgTTATTf0VkgAUmSleYlvCRFP1PGkdF2yra57qNE5ghCzuwB4dgQwmqcAY1qAOBK7iFe3gwro0749F4mo1mjPedbfgG4/kNNNaduA==</latexit><latexit sha1_base64="EL+Q1x+C71y+qzEf13d7koRz6BU=">AAACD3icdVDNS8MwHE39nPOr6lGQ4FA8jNJ6cNtFBl48TnAfsJaRpukWlrQlSYVR9h948ah/hhcPinj16s3/xnRT8fNB4OW934/kPT9hVCrbfjVmZufmFxYLS8XlldW1dXNjsyXjVGDSxDGLRcdHkjAakaaiipFOIgjiPiNtf3iS++0LIiSNo3M1SojHUT+iIcVIaaln7rsZgi5HiVQx9MvQ/7zgMnRZECsJ3XGxZ5Zsq1apVmtH8DdxLHuCUn3nOsdNo2e+uEGMU04ihRmSsuvYifIyJBTFjIyLbipJgvAQ9UlX0whxIr1skmcM97QSwDAW+kQKTtSvGxniUo64ryc5UgP508vFv7xuqsKql9EoSRWJ8PShMGVQx83LgQEVBCs20gRhQfVfIR4ggbDSFeYlfCSF/5PWoeXYlnOm2zgGUxTANtgFB8ABFVAHp6ABmgCDS3AL7sGDcWXcGY/G03R0xnjf2QLfYDy/AZITn30=</latexit><latexit sha1_base64="EL+Q1x+C71y+qzEf13d7koRz6BU=">AAACD3icdVDNS8MwHE39nPOr6lGQ4FA8jNJ6cNtFBl48TnAfsJaRpukWlrQlSYVR9h948ah/hhcPinj16s3/xnRT8fNB4OW934/kPT9hVCrbfjVmZufmFxYLS8XlldW1dXNjsyXjVGDSxDGLRcdHkjAakaaiipFOIgjiPiNtf3iS++0LIiSNo3M1SojHUT+iIcVIaaln7rsZgi5HiVQx9MvQ/7zgMnRZECsJ3XGxZ5Zsq1apVmtH8DdxLHuCUn3nOsdNo2e+uEGMU04ihRmSsuvYifIyJBTFjIyLbipJgvAQ9UlX0whxIr1skmcM97QSwDAW+kQKTtSvGxniUo64ryc5UgP508vFv7xuqsKql9EoSRWJ8PShMGVQx83LgQEVBCs20gRhQfVfIR4ggbDSFeYlfCSF/5PWoeXYlnOm2zgGUxTANtgFB8ABFVAHp6ABmgCDS3AL7sGDcWXcGY/G03R0xnjf2QLfYDy/AZITn30=</latexit><latexit sha1_base64="+qXmXDvbsp9dxNODp3hOJ51qX74=">AAACD3icdVBLSwMxGMz6rPW16tFLsCgeStn1YNuLFLx4rGAf0F1KNpttQ7PJkmSFsvQfePGvePGgiFev3vw3ZtsqPgcCk5nvI5kJEkaVdpw3a2FxaXlltbBWXN/Y3Nq2d3bbSqQSkxYWTMhugBRhlJOWppqRbiIJigNGOsHoPPc710QqKviVHifEj9GA04hipI3Ut4+8DEEvRonSAgZlGHxecBl6LBRaQW9S7Nslp1Kv1mr1U/ibuBVnihKYo9m3X71Q4DQmXGOGlOq5TqL9DElNMSOTopcqkiA8QgPSM5SjmCg/m+aZwEOjhDAS0hyu4VT9upGhWKlxHJjJGOmh+unl4l9eL9VRzc8oT1JNOJ49FKUMmrh5OTCkkmDNxoYgLKn5K8RDJBHWpsK8hI+k8H/SPqm4TsW9dEqNs3kdBbAPDsAxcEEVNMAFaIIWwOAG3IEH8GjdWvfWk/U8G12w5jt74Busl3dBBJuI</latexit>
{b 7! a, c 7! b, . . .}<latexit sha1_base64="5hczuU3PZbTCk1ak6zzIIIj/v8M=">AAACD3icdVDLSgMxFL1TX7W+Rl0KEiyKi1JmXNh2IwU3LivYB3RKyWTSNjTzIMkIZegfuHHZnd/gxoUibt2682/MtCo+DwROzrmX5Bw34kwqy3o1MnPzC4tL2eXcyura+oa5udWQYSwIrZOQh6LlYkk5C2hdMcVpKxIU+y6nTXd4mvrNSyokC4MLNYpox8f9gPUYwUpLXfPASVzk+DiSKkS4gMjnxS0gh3uhksgZ57pm3ipWSuVy5Rj9JnbRmiJf3Z1MbgCg1jVfHC8ksU8DRTiWsm1bkeokWChGOB3nnFjSCJMh7tO2pgH2qewk0zxjtK8VD/VCoU+g0FT9upFgX8qR7+pJH6uB/Oml4l9eO1a9cidhQRQrGpDZQ72YIx03LQd5TFCi+EgTTATTf0VkgAUmSleYlvCRFP1PGkdF2yra57qNE5ghCzuwB4dgQwmqcAY1qAOBK7iFe3gwro0749F4mo1mjPedbfgG4/kNNOqduA==</latexit><latexit sha1_base64="f+favxxu8FcopNxNN2gP3rsZ8yU=">AAACD3icdVDNS8MwHE39nPOr6lGQ4FA8jNJ6cNtFBl48TnAfsJaRpukWlrQlSYVR9h948ah/hhcPinj16s3/xnRT8fNB4OW934/kPT9hVCrbfjVmZufmFxYLS8XlldW1dXNjsyXjVGDSxDGLRcdHkjAakaaiipFOIgjiPiNtf3iS++0LIiSNo3M1SojHUT+iIcVIaaln7ruZD12OEqliiMoQf178MnRZECsJ3XGxZ5Zsq1apVmtH8DdxLHuCUn3nOsdNo2e+uEGMU04ihRmSsuvYifIyJBTFjIyLbipJgvAQ9UlX0whxIr1skmcM97QSwDAW+kQKTtSvGxniUo64ryc5UgP508vFv7xuqsKql9EoSRWJ8PShMGVQx83LgQEVBCs20gRhQfVfIR4ggbDSFeYlfCSF/5PWoeXYlnOm2zgGUxTANtgFB8ABFVAHp6ABmgCDS3AL7sGDcWXcGY/G03R0xnjf2QLfYDy/AZInn30=</latexit><latexit sha1_base64="f+favxxu8FcopNxNN2gP3rsZ8yU=">AAACD3icdVDNS8MwHE39nPOr6lGQ4FA8jNJ6cNtFBl48TnAfsJaRpukWlrQlSYVR9h948ah/hhcPinj16s3/xnRT8fNB4OW934/kPT9hVCrbfjVmZufmFxYLS8XlldW1dXNjsyXjVGDSxDGLRcdHkjAakaaiipFOIgjiPiNtf3iS++0LIiSNo3M1SojHUT+iIcVIaaln7ruZD12OEqliiMoQf178MnRZECsJ3XGxZ5Zsq1apVmtH8DdxLHuCUn3nOsdNo2e+uEGMU04ihRmSsuvYifIyJBTFjIyLbipJgvAQ9UlX0whxIr1skmcM97QSwDAW+kQKTtSvGxniUo64ryc5UgP508vFv7xuqsKql9EoSRWJ8PShMGVQx83LgQEVBCs20gRhQfVfIR4ggbDSFeYlfCSF/5PWoeXYlnOm2zgGUxTANtgFB8ABFVAHp6ABmgCDS3AL7sGDcWXcGY/G03R0xnjf2QLfYDy/AZInn30=</latexit><latexit sha1_base64="9IzG5xCESr5mu8279n94muQyH4w=">AAACD3icdVBLSwMxGMz6rPW16tFLsCgeStn1YNuLFLx4rGAf0F1KNpttQ7PJkmSFsvQfePGvePGgiFev3vw3ZtsqPgcCk5nvI5kJEkaVdpw3a2FxaXlltbBWXN/Y3Nq2d3bbSqQSkxYWTMhugBRhlJOWppqRbiIJigNGOsHoPPc710QqKviVHifEj9GA04hipI3Ut4+8LIBejBKlBURliD8vQRl6LBRaQW9S7Nslp1Kv1mr1U/ibuBVnihKYo9m3X71Q4DQmXGOGlOq5TqL9DElNMSOTopcqkiA8QgPSM5SjmCg/m+aZwEOjhDAS0hyu4VT9upGhWKlxHJjJGOmh+unl4l9eL9VRzc8oT1JNOJ49FKUMmrh5OTCkkmDNxoYgLKn5K8RDJBHWpsK8hI+k8H/SPqm4TsW9dEqNs3kdBbAPDsAxcEEVNMAFaIIWwOAG3IEH8GjdWvfWk/U8G12w5jt74Busl3dBGJuI</latexit>
Encryption =
Decryption =
Keys:
12. 1. Introduction
Cipher textPlain text
encryption
decryption
“the cat sat on the mat” “uif dbu tbu po uif nbu”
1. Choose algorithm
2. Choose key
1. Deduce algorithm
2. Deduce key
Encryption: Decryption:
Encryption & decryption
“Mono-Alphabetic Substitution Cipher” (MASC)
Replace each plain text letter with a single, fixed cipher text letter.
Algorithm:
{a 7! b, b 7! c, . . .}<latexit sha1_base64="v4rjKncKUxiOht1plgEILCpWNAA=">AAACD3icdVDLSgMxFL1TX7W+Rl0KEiyKi1JmXNh2IwU3LivYB3RKyWTSNjTzIMkIZegfuHHZnd/gxoUibt2682/MtCo+DwROzrmX5Bw34kwqy3o1MnPzC4tL2eXcyura+oa5udWQYSwIrZOQh6LlYkk5C2hdMcVpKxIU+y6nTXd4mvrNSyokC4MLNYpox8f9gPUYwUpLXfPASTByfBxJFSK3gNzPCykgh3uhksgZ57pm3ipWSuVy5Rj9JnbRmiJf3Z1MbgCg1jVfHC8ksU8DRTiWsm1bkeokWChGOB3nnFjSCJMh7tO2pgH2qewk0zxjtK8VD/VCoU+g0FT9upFgX8qR7+pJH6uB/Oml4l9eO1a9cidhQRQrGpDZQ72YIx03LQd5TFCi+EgTTATTf0VkgAUmSleYlvCRFP1PGkdF2yra57qNE5ghCzuwB4dgQwmqcAY1qAOBK7iFe3gwro0749F4mo1mjPedbfgG4/kNNNaduA==</latexit><latexit sha1_base64="EL+Q1x+C71y+qzEf13d7koRz6BU=">AAACD3icdVDNS8MwHE39nPOr6lGQ4FA8jNJ6cNtFBl48TnAfsJaRpukWlrQlSYVR9h948ah/hhcPinj16s3/xnRT8fNB4OW934/kPT9hVCrbfjVmZufmFxYLS8XlldW1dXNjsyXjVGDSxDGLRcdHkjAakaaiipFOIgjiPiNtf3iS++0LIiSNo3M1SojHUT+iIcVIaaln7rsZgi5HiVQx9MvQ/7zgMnRZECsJ3XGxZ5Zsq1apVmtH8DdxLHuCUn3nOsdNo2e+uEGMU04ihRmSsuvYifIyJBTFjIyLbipJgvAQ9UlX0whxIr1skmcM97QSwDAW+kQKTtSvGxniUo64ryc5UgP508vFv7xuqsKql9EoSRWJ8PShMGVQx83LgQEVBCs20gRhQfVfIR4ggbDSFeYlfCSF/5PWoeXYlnOm2zgGUxTANtgFB8ABFVAHp6ABmgCDS3AL7sGDcWXcGY/G03R0xnjf2QLfYDy/AZITn30=</latexit><latexit sha1_base64="EL+Q1x+C71y+qzEf13d7koRz6BU=">AAACD3icdVDNS8MwHE39nPOr6lGQ4FA8jNJ6cNtFBl48TnAfsJaRpukWlrQlSYVR9h948ah/hhcPinj16s3/xnRT8fNB4OW934/kPT9hVCrbfjVmZufmFxYLS8XlldW1dXNjsyXjVGDSxDGLRcdHkjAakaaiipFOIgjiPiNtf3iS++0LIiSNo3M1SojHUT+iIcVIaaln7rsZgi5HiVQx9MvQ/7zgMnRZECsJ3XGxZ5Zsq1apVmtH8DdxLHuCUn3nOsdNo2e+uEGMU04ihRmSsuvYifIyJBTFjIyLbipJgvAQ9UlX0whxIr1skmcM97QSwDAW+kQKTtSvGxniUo64ryc5UgP508vFv7xuqsKql9EoSRWJ8PShMGVQx83LgQEVBCs20gRhQfVfIR4ggbDSFeYlfCSF/5PWoeXYlnOm2zgGUxTANtgFB8ABFVAHp6ABmgCDS3AL7sGDcWXcGY/G03R0xnjf2QLfYDy/AZITn30=</latexit><latexit sha1_base64="+qXmXDvbsp9dxNODp3hOJ51qX74=">AAACD3icdVBLSwMxGMz6rPW16tFLsCgeStn1YNuLFLx4rGAf0F1KNpttQ7PJkmSFsvQfePGvePGgiFev3vw3ZtsqPgcCk5nvI5kJEkaVdpw3a2FxaXlltbBWXN/Y3Nq2d3bbSqQSkxYWTMhugBRhlJOWppqRbiIJigNGOsHoPPc710QqKviVHifEj9GA04hipI3Ut4+8DEEvRonSAgZlGHxecBl6LBRaQW9S7Nslp1Kv1mr1U/ibuBVnihKYo9m3X71Q4DQmXGOGlOq5TqL9DElNMSOTopcqkiA8QgPSM5SjmCg/m+aZwEOjhDAS0hyu4VT9upGhWKlxHJjJGOmh+unl4l9eL9VRzc8oT1JNOJ49FKUMmrh5OTCkkmDNxoYgLKn5K8RDJBHWpsK8hI+k8H/SPqm4TsW9dEqNs3kdBbAPDsAxcEEVNMAFaIIWwOAG3IEH8GjdWvfWk/U8G12w5jt74Busl3dBBJuI</latexit>
{b 7! a, c 7! b, . . .}<latexit sha1_base64="5hczuU3PZbTCk1ak6zzIIIj/v8M=">AAACD3icdVDLSgMxFL1TX7W+Rl0KEiyKi1JmXNh2IwU3LivYB3RKyWTSNjTzIMkIZegfuHHZnd/gxoUibt2682/MtCo+DwROzrmX5Bw34kwqy3o1MnPzC4tL2eXcyura+oa5udWQYSwIrZOQh6LlYkk5C2hdMcVpKxIU+y6nTXd4mvrNSyokC4MLNYpox8f9gPUYwUpLXfPASVzk+DiSKkS4gMjnxS0gh3uhksgZ57pm3ipWSuVy5Rj9JnbRmiJf3Z1MbgCg1jVfHC8ksU8DRTiWsm1bkeokWChGOB3nnFjSCJMh7tO2pgH2qewk0zxjtK8VD/VCoU+g0FT9upFgX8qR7+pJH6uB/Oml4l9eO1a9cidhQRQrGpDZQ72YIx03LQd5TFCi+EgTTATTf0VkgAUmSleYlvCRFP1PGkdF2yra57qNE5ghCzuwB4dgQwmqcAY1qAOBK7iFe3gwro0749F4mo1mjPedbfgG4/kNNOqduA==</latexit><latexit sha1_base64="f+favxxu8FcopNxNN2gP3rsZ8yU=">AAACD3icdVDNS8MwHE39nPOr6lGQ4FA8jNJ6cNtFBl48TnAfsJaRpukWlrQlSYVR9h948ah/hhcPinj16s3/xnRT8fNB4OW934/kPT9hVCrbfjVmZufmFxYLS8XlldW1dXNjsyXjVGDSxDGLRcdHkjAakaaiipFOIgjiPiNtf3iS++0LIiSNo3M1SojHUT+iIcVIaaln7ruZD12OEqliiMoQf178MnRZECsJ3XGxZ5Zsq1apVmtH8DdxLHuCUn3nOsdNo2e+uEGMU04ihRmSsuvYifIyJBTFjIyLbipJgvAQ9UlX0whxIr1skmcM97QSwDAW+kQKTtSvGxniUo64ryc5UgP508vFv7xuqsKql9EoSRWJ8PShMGVQx83LgQEVBCs20gRhQfVfIR4ggbDSFeYlfCSF/5PWoeXYlnOm2zgGUxTANtgFB8ABFVAHp6ABmgCDS3AL7sGDcWXcGY/G03R0xnjf2QLfYDy/AZInn30=</latexit><latexit sha1_base64="f+favxxu8FcopNxNN2gP3rsZ8yU=">AAACD3icdVDNS8MwHE39nPOr6lGQ4FA8jNJ6cNtFBl48TnAfsJaRpukWlrQlSYVR9h948ah/hhcPinj16s3/xnRT8fNB4OW934/kPT9hVCrbfjVmZufmFxYLS8XlldW1dXNjsyXjVGDSxDGLRcdHkjAakaaiipFOIgjiPiNtf3iS++0LIiSNo3M1SojHUT+iIcVIaaln7ruZD12OEqliiMoQf178MnRZECsJ3XGxZ5Zsq1apVmtH8DdxLHuCUn3nOsdNo2e+uEGMU04ihRmSsuvYifIyJBTFjIyLbipJgvAQ9UlX0whxIr1skmcM97QSwDAW+kQKTtSvGxniUo64ryc5UgP508vFv7xuqsKql9EoSRWJ8PShMGVQx83LgQEVBCs20gRhQfVfIR4ggbDSFeYlfCSF/5PWoeXYlnOm2zgGUxTANtgFB8ABFVAHp6ABmgCDS3AL7sGDcWXcGY/G03R0xnjf2QLfYDy/AZInn30=</latexit><latexit sha1_base64="9IzG5xCESr5mu8279n94muQyH4w=">AAACD3icdVBLSwMxGMz6rPW16tFLsCgeStn1YNuLFLx4rGAf0F1KNpttQ7PJkmSFsvQfePGvePGgiFev3vw3ZtsqPgcCk5nvI5kJEkaVdpw3a2FxaXlltbBWXN/Y3Nq2d3bbSqQSkxYWTMhugBRhlJOWppqRbiIJigNGOsHoPPc710QqKviVHifEj9GA04hipI3Ut4+8LIBejBKlBURliD8vQRl6LBRaQW9S7Nslp1Kv1mr1U/ibuBVnihKYo9m3X71Q4DQmXGOGlOq5TqL9DElNMSOTopcqkiA8QgPSM5SjmCg/m+aZwEOjhDAS0hyu4VT9upGhWKlxHJjJGOmh+unl4l9eL9VRzc8oT1JNOJ49FKUMmrh5OTCkkmDNxoYgLKn5K8RDJBHWpsK8hI+k8H/SPqm4TsW9dEqNs3kdBbAPDsAxcEEVNMAFaIIWwOAG3IEH8GjdWvfWk/U8G12w5jt74Busl3dBGJuI</latexit>
Encryption =
Decryption =
Keys:
13. A “Mono-Alphabetic Substitution Cipher” (MASC) means:
Replace each plain text letter with a single, fixed cipher text letter.
Important
“the cat sat on the mat” “uif dbu tbu po uif nbu”
From now on: I only talk about MASCs.
16. 2. Framing the problem
1. We know cipher text is
MASC-encrypted
Assumptions
17. 2. Framing the problem
2. We have “enough” cipher text
1. We know cipher text is
MASC-encrypted
Assumptions
18. 2. Framing the problem
2. We have “enough” cipher text
3. Punctuation stripped, encryption
preserves spaces
1. We know cipher text is
MASC-encrypted
Assumptions
19. 2. Framing the problem
2. We have “enough” cipher text
3. Punctuation stripped, encryption
preserves spaces
1. We know cipher text is
MASC-encrypted
4. We know, & have access to
text from, the source language
Assumptions
20. 2. Framing the problem
2. We have “enough” cipher text
3. Punctuation stripped, encryption
preserves spaces
1. We know cipher text is
MASC-encrypted
4. We know, & have access to
text from, the source language
Assumptions Consequences
21. 2. Framing the problem
2. We have “enough” cipher text
3. Punctuation stripped, encryption
preserves spaces
1. We know cipher text is
MASC-encrypted
4. We know, & have access to
text from, the source language
1. and 2. make problem feasible
Assumptions Consequences
22. 2. Framing the problem
2. We have “enough” cipher text
3. Punctuation stripped, encryption
preserves spaces
1. We know cipher text is
MASC-encrypted
4. We know, & have access to
text from, the source language
1. and 2. make problem feasible
3. means we can use statistics on
character sequences
Assumptions Consequences
23. 2. Framing the problem
2. We have “enough” cipher text
3. Punctuation stripped, encryption
preserves spaces
1. We know cipher text is
MASC-encrypted
4. We know, & have access to
text from, the source language
1. and 2. make problem feasible
3. means we can use statistics on
character sequences
4. means we can use ML
on “training text”.
Assumptions Consequences
27. a b dc
a b dc
Permutations
Permutation: A rearrangement of distinct objects (for us, letters)
arrow diagramarrow diagram
Different notation
Formally: one-to-one map from a finite set to itself
28. {a: b, b: c, c: a, d: d}
a b dc
a b dc
arrow diagram
Permutations
Formally: one-to-one map from a finite set to itself
arrow diagram
Different notation
Permutation: A rearrangement of distinct objects (for us, letters)
dictionary
29. Formally: one-to-one map from a finite set to itself
{a: b, b: c, c: a, d: d}
dictionary
a b dc
a b dc
arrow diagram
Different notation
cycles
(abc)(d) = (abc)
Permutations
Permutation: A rearrangement of distinct objects (for us, letters)
30. cipher text alphabet plain text alphabet6=<latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit>
31. cipher text alphabet plain text alphabet6=<latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit>
“the cat sat on the mat” “⧫︎♒♏ ♍♋⧫︎ ⬧♋⧫︎ □︎■︎ ⧫︎♒♏ ❍♋⧫︎”!<latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit>
32. cipher text alphabet plain text alphabet6=<latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit>
“the cat sat on the mat” “⧫︎♒♏ ♍♋⧫︎ ⬧♋⧫︎ □︎■︎ ⧫︎♒♏ ❍♋⧫︎”!<latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit>
However, MASC encryption means plain- and cipher text alphabets
correspond one-to-one:
33. cipher text alphabet plain text alphabet6=<latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit>
“the cat sat on the mat” “⧫︎♒♏ ♍♋⧫︎ ⬧♋⧫︎ □︎■︎ ⧫︎♒♏ ❍♋⧫︎”!<latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit>
However, MASC encryption means plain- and cipher text alphabets
correspond one-to-one:
⧫︎ ♒♏ ♍♋ ⬧ □︎ ■︎❍
ca e m n o s th
34. cipher text alphabet plain text alphabet6=<latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit>
“the cat sat on the mat” “⧫︎♒♏ ♍♋⧫︎ ⬧♋⧫︎ □︎■︎ ⧫︎♒♏ ❍♋⧫︎”!<latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit>
However, MASC encryption means plain- and cipher text alphabets
correspond one-to-one:
⧫︎ ♒♏ ♍♋ ⬧ □︎ ■︎❍
ca e m n o s th
“the cat sat on the mat” !<latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit>
“osc heo meo nt oso aeo”
35. cipher text alphabet plain text alphabet6=<latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit>
“the cat sat on the mat” “⧫︎♒♏ ♍♋⧫︎ ⬧♋⧫︎ □︎■︎ ⧫︎♒♏ ❍♋⧫︎”!<latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit>
However, MASC encryption means plain- and cipher text alphabets
correspond one-to-one:
⧫︎ ♒♏ ♍♋ ⬧ □︎ ■︎❍
ca e m n o s th
“the cat sat on the mat” !<latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit>
“osc heo meo nt oso aeo”
Can assume cipher text and plain text have same alphabet
36. cipher text alphabet plain text alphabet6=<latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit><latexit sha1_base64="oeVIw5oD/ZHewQ4HSdkzrUVYJ9Y=">AAAB63icdVDLSsNAFJ3UV62vqks3g0VwFRL7SJYFXbisYB/QhjKZTtqhM5M4MxFK6C+4caGIW3/InX/jpK2gogcuHM65l3vvCRNGlXacD6uwtr6xuVXcLu3s7u0flA+POipOJSZtHLNY9kKkCKOCtDXVjPQSSRAPGemG08vc794TqWgsbvUsIQFHY0EjipHOpYEgd8NyxbF9z69VXejYda9R83Li1ht+owpd21mgAlZoDcvvg1GMU06Exgwp1XedRAcZkppiRualQapIgvAUjUnfUIE4UUG2uHUOz4wyglEsTQkNF+r3iQxxpWY8NJ0c6Yn67eXiX14/1ZEfZFQkqSYCLxdFKYM6hvnjcEQlwZrNDEFYUnMrxBMkEdYmnpIJ4etT+D/pXNiuSeamVmlereIoghNwCs6BCzzQBNegBdoAgwl4AE/g2eLWo/VivS5bC9Zq5hj8gPX2CZsXjp4=</latexit>
“the cat sat on the mat” “⧫︎♒♏ ♍♋⧫︎ ⬧♋⧫︎ □︎■︎ ⧫︎♒♏ ❍♋⧫︎”!<latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit>
However, MASC encryption means plain- and cipher text alphabets
correspond one-to-one:
⧫︎ ♒♏ ♍♋ ⬧ □︎ ■︎❍
ca e m n o s th
“the cat sat on the mat” !<latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit><latexit sha1_base64="VUwNDctZDZEgUdxnnuk75cyH/NM=">AAAB/HicdVDLSgMxFM34rPVV7dJNsAiuhowK2l1BFy4r2Ae0Q8mkmTY0kwzJHaWU+ituXCji1g9x59+YPgSfBy4czrmXe++JUiksEPLuLSwuLa+s5tby6xubW9uFnd261ZlhvMa01KYZUculULwGAiRvpobTJJK8EQ3OJ37jhhsrtLqGYcrDhPaUiAWj4KROodiWWvUkj8GIXh+oMfq2UygRv1w+JoTg3yTwyRQlNEe1U3hrdzXLEq6ASWptKyAphCNqQDDJx/l2ZnlK2YD2eMtRRRNuw9H0+DE+cEoXx9q4UoCn6teJEU2sHSaR60wo9O1PbyL+5bUyiM/CkVBpBlyx2aI4kxg0niSBu8JwBnLoCGVGuFsx61NDGbi88i6Ez0/x/6R+5AfED65OSpWLeRw5tIf20SEK0CmqoEtURTXE0BDdo0f05N15D96z9zJrXfDmM0X0Dd7rBwWylao=</latexit>
“osc heo meo nt oso aeo”
Can assume cipher text and plain text have same alphabet
Hence: Decryption key is a permutation
37. Given space-preserved, MASC-encrypted cipher text of known
source language with alphabet , and training sample of text
from , find the permutation of that is the decryption key.
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Task
Notation
If is any text and is a permutation of , then means the
text obtained by applying to .
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39. 3. Naive algorithm
A<latexit sha1_base64="N+ImR/GzV2tF2To3J0P4l87wT6c=">AAAB6HicdVDJSgNBEK2JW4xb1KOXxiB4GmZEiblIxIvHBMwCyRB6OjVJm56F7h4hDPkCLx4U8eonefNv7CyC64OCx3tVVNXzE8GVdpx3K7e0vLK6ll8vbGxube8Ud/eaKk4lwwaLRSzbPlUoeIQNzbXAdiKRhr7Alj+6mvqtO5SKx9GNHifohXQQ8YAzqo1Uv+wVS45dqZw65TPym7i2M0MJFqj1im/dfszSECPNBFWq4zqJ9jIqNWcCJ4VuqjChbEQH2DE0oiEqL5sdOiFHRumTIJamIk1m6teJjIZKjUPfdIZUD9VPbyr+5XVSHZx7GY+SVGPE5ouCVBAdk+nXpM8lMi3GhlAmubmVsCGVlGmTTcGE8Pkp+Z80T2zXsd36aal6sYgjDwdwCMfgQhmqcA01aAADhHt4hCfr1nqwnq2XeWvOWszswzdYrx8lhI0n</latexit><latexit sha1_base64="N+ImR/GzV2tF2To3J0P4l87wT6c=">AAAB6HicdVDJSgNBEK2JW4xb1KOXxiB4GmZEiblIxIvHBMwCyRB6OjVJm56F7h4hDPkCLx4U8eonefNv7CyC64OCx3tVVNXzE8GVdpx3K7e0vLK6ll8vbGxube8Ud/eaKk4lwwaLRSzbPlUoeIQNzbXAdiKRhr7Alj+6mvqtO5SKx9GNHifohXQQ8YAzqo1Uv+wVS45dqZw65TPym7i2M0MJFqj1im/dfszSECPNBFWq4zqJ9jIqNWcCJ4VuqjChbEQH2DE0oiEqL5sdOiFHRumTIJamIk1m6teJjIZKjUPfdIZUD9VPbyr+5XVSHZx7GY+SVGPE5ouCVBAdk+nXpM8lMi3GhlAmubmVsCGVlGmTTcGE8Pkp+Z80T2zXsd36aal6sYgjDwdwCMfgQhmqcA01aAADhHt4hCfr1nqwnq2XeWvOWszswzdYrx8lhI0n</latexit><latexit sha1_base64="N+ImR/GzV2tF2To3J0P4l87wT6c=">AAAB6HicdVDJSgNBEK2JW4xb1KOXxiB4GmZEiblIxIvHBMwCyRB6OjVJm56F7h4hDPkCLx4U8eonefNv7CyC64OCx3tVVNXzE8GVdpx3K7e0vLK6ll8vbGxube8Ud/eaKk4lwwaLRSzbPlUoeIQNzbXAdiKRhr7Alj+6mvqtO5SKx9GNHifohXQQ8YAzqo1Uv+wVS45dqZw65TPym7i2M0MJFqj1im/dfszSECPNBFWq4zqJ9jIqNWcCJ4VuqjChbEQH2DE0oiEqL5sdOiFHRumTIJamIk1m6teJjIZKjUPfdIZUD9VPbyr+5XVSHZx7GY+SVGPE5ouCVBAdk+nXpM8lMi3GhlAmubmVsCGVlGmTTcGE8Pkp+Z80T2zXsd36aal6sYgjDwdwCMfgQhmqcA01aAADhHt4hCfr1nqwnq2XeWvOWszswzdYrx8lhI0n</latexit><latexit sha1_base64="N+ImR/GzV2tF2To3J0P4l87wT6c=">AAAB6HicdVDJSgNBEK2JW4xb1KOXxiB4GmZEiblIxIvHBMwCyRB6OjVJm56F7h4hDPkCLx4U8eonefNv7CyC64OCx3tVVNXzE8GVdpx3K7e0vLK6ll8vbGxube8Ud/eaKk4lwwaLRSzbPlUoeIQNzbXAdiKRhr7Alj+6mvqtO5SKx9GNHifohXQQ8YAzqo1Uv+wVS45dqZw65TPym7i2M0MJFqj1im/dfszSECPNBFWq4zqJ9jIqNWcCJ4VuqjChbEQH2DE0oiEqL5sdOiFHRumTIJamIk1m6teJjIZKjUPfdIZUD9VPbyr+5XVSHZx7GY+SVGPE5ouCVBAdk+nXpM8lMi3GhlAmubmVsCGVlGmTTcGE8Pkp+Z80T2zXsd36aal6sYgjDwdwCMfgQhmqcA01aAADhHt4hCfr1nqwnq2XeWvOWszswzdYrx8lhI0n</latexit>
Iterate over all permutations of until we get the right answer.
Algorithm
40. 3. Naive algorithm
A<latexit sha1_base64="N+ImR/GzV2tF2To3J0P4l87wT6c=">AAAB6HicdVDJSgNBEK2JW4xb1KOXxiB4GmZEiblIxIvHBMwCyRB6OjVJm56F7h4hDPkCLx4U8eonefNv7CyC64OCx3tVVNXzE8GVdpx3K7e0vLK6ll8vbGxube8Ud/eaKk4lwwaLRSzbPlUoeIQNzbXAdiKRhr7Alj+6mvqtO5SKx9GNHifohXQQ8YAzqo1Uv+wVS45dqZw65TPym7i2M0MJFqj1im/dfszSECPNBFWq4zqJ9jIqNWcCJ4VuqjChbEQH2DE0oiEqL5sdOiFHRumTIJamIk1m6teJjIZKjUPfdIZUD9VPbyr+5XVSHZx7GY+SVGPE5ouCVBAdk+nXpM8lMi3GhlAmubmVsCGVlGmTTcGE8Pkp+Z80T2zXsd36aal6sYgjDwdwCMfgQhmqcA01aAADhHt4hCfr1nqwnq2XeWvOWszswzdYrx8lhI0n</latexit><latexit sha1_base64="N+ImR/GzV2tF2To3J0P4l87wT6c=">AAAB6HicdVDJSgNBEK2JW4xb1KOXxiB4GmZEiblIxIvHBMwCyRB6OjVJm56F7h4hDPkCLx4U8eonefNv7CyC64OCx3tVVNXzE8GVdpx3K7e0vLK6ll8vbGxube8Ud/eaKk4lwwaLRSzbPlUoeIQNzbXAdiKRhr7Alj+6mvqtO5SKx9GNHifohXQQ8YAzqo1Uv+wVS45dqZw65TPym7i2M0MJFqj1im/dfszSECPNBFWq4zqJ9jIqNWcCJ4VuqjChbEQH2DE0oiEqL5sdOiFHRumTIJamIk1m6teJjIZKjUPfdIZUD9VPbyr+5XVSHZx7GY+SVGPE5ouCVBAdk+nXpM8lMi3GhlAmubmVsCGVlGmTTcGE8Pkp+Z80T2zXsd36aal6sYgjDwdwCMfgQhmqcA01aAADhHt4hCfr1nqwnq2XeWvOWszswzdYrx8lhI0n</latexit><latexit sha1_base64="N+ImR/GzV2tF2To3J0P4l87wT6c=">AAAB6HicdVDJSgNBEK2JW4xb1KOXxiB4GmZEiblIxIvHBMwCyRB6OjVJm56F7h4hDPkCLx4U8eonefNv7CyC64OCx3tVVNXzE8GVdpx3K7e0vLK6ll8vbGxube8Ud/eaKk4lwwaLRSzbPlUoeIQNzbXAdiKRhr7Alj+6mvqtO5SKx9GNHifohXQQ8YAzqo1Uv+wVS45dqZw65TPym7i2M0MJFqj1im/dfszSECPNBFWq4zqJ9jIqNWcCJ4VuqjChbEQH2DE0oiEqL5sdOiFHRumTIJamIk1m6teJjIZKjUPfdIZUD9VPbyr+5XVSHZx7GY+SVGPE5ouCVBAdk+nXpM8lMi3GhlAmubmVsCGVlGmTTcGE8Pkp+Z80T2zXsd36aal6sYgjDwdwCMfgQhmqcA01aAADhHt4hCfr1nqwnq2XeWvOWszswzdYrx8lhI0n</latexit><latexit sha1_base64="N+ImR/GzV2tF2To3J0P4l87wT6c=">AAAB6HicdVDJSgNBEK2JW4xb1KOXxiB4GmZEiblIxIvHBMwCyRB6OjVJm56F7h4hDPkCLx4U8eonefNv7CyC64OCx3tVVNXzE8GVdpx3K7e0vLK6ll8vbGxube8Ud/eaKk4lwwaLRSzbPlUoeIQNzbXAdiKRhr7Alj+6mvqtO5SKx9GNHifohXQQ8YAzqo1Uv+wVS45dqZw65TPym7i2M0MJFqj1im/dfszSECPNBFWq4zqJ9jIqNWcCJ4VuqjChbEQH2DE0oiEqL5sdOiFHRumTIJamIk1m6teJjIZKjUPfdIZUD9VPbyr+5XVSHZx7GY+SVGPE5ouCVBAdk+nXpM8lMi3GhlAmubmVsCGVlGmTTcGE8Pkp+Z80T2zXsd36aal6sYgjDwdwCMfgQhmqcA01aAADhHt4hCfr1nqwnq2XeWvOWszswzdYrx8lhI0n</latexit>
Iterate over all permutations of until we get the right answer.
1. Set := idA 2 Perm(A)<latexit sha1_base64="6FUOvOxNzPJS9bf6hxSU+MZCmO0=">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</latexit><latexit sha1_base64="6FUOvOxNzPJS9bf6hxSU+MZCmO0=">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</latexit><latexit sha1_base64="6FUOvOxNzPJS9bf6hxSU+MZCmO0=">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</latexit><latexit sha1_base64="6FUOvOxNzPJS9bf6hxSU+MZCmO0=">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</latexit>
Algorithm